Скачать или смотреть Resolving mat-checkbox Injection Errors in Angular 5 Lazy Loaded Modules

Learn how to solve common injection errors with Angular Material's `mat-checkbox` component when implementing lazy loading in Angular 5 projects. Discover the necessary imports and providers needed for a successful implementation.
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Troubleshooting Angular 5 Lazy Loading: Fixing mat-checkbox Injection Errors

If you're working with Angular 5 and are integrating lazy-loaded modules, you might run into some frustrating issues, especially when it comes to Angular Material components like mat-checkbox. In this guide, we will explore this common problem and guide you through the solution step by step.

The Problem

As you dive into lazy loading components, you may encounter the following error related to mat-checkbox:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that Angular is unable to find a provider for the mat-checkbox-click-action, and it can happen with several Angular Material components when set up in a lazy-loaded structure.

Example Scenario

In our example, you have the following architecture setup in your app:

The app.module imports dashboard.module in a non-lazy way.

The dashboard.module imports test.module in a lazy way.

The test.module consists of a component that triggers the aforementioned error.

Solution Overview

The solution to this problem typically involves adding necessary providers or imports for Angular Material components in your modules. Here’s how you can resolve it effectively.

Step 1: Identify Necessary Imports

To avoid the injection errors you're experiencing, ensure that the required Angular Material module (MatCheckboxModule) is imported correctly in the appropriate modules. Here’s what to do:

Import MatCheckboxModule in your dashboard.module.

Configure the providers needed for mat-checkbox in your app.module.

Step 2: Update Your App Module

You’ll need to make changes in your app.module.ts file. Here is how:

Add MatCheckboxModule: Make sure you include MatCheckboxModule in the imports array.

[[See Video to Reveal this Text or Code Snippet]]

Add Providers (if necessary): If you still experience issues, you may also need to add the provider MAT_CHECKBOX_CLICK_ACTION to your module's provider section.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Verify Module Structure

Ensure your module structure adheres to Angular conventions. For instance, your dashboard.module.ts might look like this:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

In summary, if you encounter injection errors with Angular Material components like mat-checkbox when using lazy loading, it's likely due to missing imports or providers. Make sure to import the necessary Angular Material modules and include the required providers in your modules. By following the steps outlined in this post, you should be able to effectively resolve these errors and successfully implement your lazy-loaded components.

Happy coding!